The purpose of this study is to investigate the use of capnography to improve patient safety during deep sedation. This study examines the effectiveness of capnography in early detection and therapy of alveolar hypoventilation during deep sedation in comparison to standard monitoring with pulse oximetry in abortion procedures. The randomized controlled trial determines whether utilizing capnography in women undergoing deep sedation with propofol (monotherapy) for abortion procedures will provide early detection of suboptimal ventilation and reduce hypoxemia. Unlike previous studies we are determined to investigate daily practice when nurses qualified in sedation management assess capnography instead of an independent observer assessing capnography. Therefore, all nurses qualified in patient sedation management and abortion doctors will be trained in assessment of capnography before the trial starts.